The Collaborative International Dictionary
dendrologist
dendrology \den*drol"o*gy\, n. [Gr. de`ndron tree + -logy: cf. F. dendrologie.]
the branch of botany studying trees and shrubs; the natural history of trees.
A discourse or treatise on trees. [1913 Webster] -- den`dro*log"ic*al, a. -- den`dro*log"ic, a. -- den*drol"o*gist, a.
Wiktionary
dendrologist
n. One versed in the natural history of trees.